The battle to keep it clean means corporate venturing groups from a diverse range of businesses are converging on clean-tech - and finding a receptive audience for their investments.

The non-state-owned, natural resource and energy producers make up some of the largest and most important companies in the world. They tend to use corporate venturing either more efficiently to find, extract and use conventional raw materials or to invest in alternative, usually renewable, natural resources. These efficiency or alternatives investments attract a much wider…

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